Rigol DS1000Z Series User Manual

Chapter 7 Protocol Decoding RIGOL
DS1000Z User’s Guide
7-5
RS232 Decoding (Option)
RS232 serial bus consists of the transmitting data line (TX) and the receiving data
line (RX).
DeviceA
DeviceB
Tx
Rx
Rx Tx
The industry standard of RS232 uses “Negative Logic”, namely high level is logic “0”
and low level is logic “1”.
1
0
0
0 0
1 1
1
1
1
By default, RS232 uses LSB (Least Significant Bit) transmission sequence, namely
the lowest bit of the data is transmitted first. While for MSB (Most Significant Bit),
the highest bit of the data is transmitted first.
Bit0 Bit5 Bit2 Bit3 Bit6 Bit1 Bit7 Bit4
t
Bit7 Bit
2
Bit
5
Bit4 Bit1
Bit6 Bit0 Bit3
t
Endian (LSB) Endian (MSB)
In RS232, baud rate is used to represent the transmitting rate (namely bits per
second) of the data. The commonly used baud rates include 2400 bps, 4800 bps,
9600 bps, 19200 bps, 38400 bps, 57600 bps and 115200 bps.
In RS232, you need to set the start bit, data bits, check bit (optional) and stop bit of
each frame of data.

Rigol DS1000Z Series Specifications

General

Brand	Rigol
Model	DS1000Z Series
Category	Test Equipment
Language	English